-er -ey b-u bbb bbc bbd bbe bbr bbu bby bcb bcc bcd bce bcr bcu bcy bdb bdc bdd bde bdr bdu bdy be- beb bec bed bee ber beu bey brb brd bre brr bru bry bub buc bud bue bur buu buy by- byc byd bye byr byu c-- cbb cbc cbd cbe cbr cbu cby ccb ccc ccd cce ccr ccu cdb cdc cdd cde cdr cdu cdy ce- ceb cec ced cee cer ceu cey crb crc crd cre crr cru cry cub cuc cud cue cur cuu cuy cyb cyc cyd cye cyr dbb dbc dbd dbe dbr dbu dby dcb dcc dcd dce dcr dcu ddb ddc ddd dde ddr ddu ddy de- deb dec ded dee der deu dey drb drc drd dre drr dru dry dub duc dud due dur duy dy- dyb dyc dyd dye dyr dyu dyy ebb ebc ebd ebe ebr ebu eby ec- ecb ecc ecd ece ecr ecu ed- edb edc edd ede edr edu edy eeb eec eed eee eer eey erb erc erd ere err eru ery eu- eub euc eud eue eur eyc eyd eye eyr rbb rbc rbd rbe rbr rbu rcb rcc rcd rce rcr rcu rdb rdc rdd rde rdr rdu rdy re- reb rec red ree rer reu rey rrb rrc rrd rrr rru rub ruc rud rue rur ruu ruy ry- ryc ryd rye ryr ryu ryy ubb ubc ube ubr ubu uby ucb ucc ucd uce ucr ucu udb udc udd ude udr udu ueb uec ued uee uer uey ur- urb urc urd ure urr uru ury uuc uue uur uuu uyc uyu ybc ybe ybr yby ycc ycd yce ycu ycy yde ydy yeb yec yed yee yer yey yrc yre yru yud yue yur yuu yuy yyb yyc yye yyu yyy